Zhu, Dongming

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Engineering Conferences International

Engineering Conferences InternationalECI Digital ArchivesThermal Barrier Coatings IV ProceedingsSummer 6-26-2014NASA’s advanced environmental barrier coatingsdevelopment for SiC/SiC Ceramic matrixcomposites: Understanding CMAS degradationsand resistanceDongming ZhuNasa Glenn Research Center, USAFollow this and additional works at: http://dc.engconfintl.org/thermal_barrier_ivPart of the Materials Science and Engineering CommonsThis Conference Proceeding is brought to you for free and open access by the Proceedings at ECI Digital Archives. It has been accepted for inclusion inThermal Barrier Coatings IV by an authorized administrator of ECI Digital Archives. For more information, please contact franco@bepress.com.Recommended CitationDongming Zhu, "NASA’s advanced environmental barrier coatings development for SiC/SiC Ceramic matrix composites:Understanding CMAS degradations and resistance" in "Thermal Barrier Coatings IV", U. Schulz, German Aerospace Center; M.Maloney, Pratt & Whitney; R. Darolia, GE Aviation (retired) Eds, ECI Symposium Series, (2015). http://dc.engconfintl.org/thermal_barrier_iv/42Thursday, June 26, 2014  Session 6 NASA’S ADVANCED ENVIRONMENTAL BARRIER COATINGS DEVELOPMENT FOR SIC/SIC CERAMIC MATRIX COMPOSITES: UNDERSTANDING CMAS DEGRADATIONS AND RESISTANCE  Dongming Zhu NASA Glenn Research Center, USA  Environmental barrier coatings (EBCs) and SiC/SiC ceramic matrix composites (CMCs) systems will play a crucial role in next generation turbine engines for hot-section component applications because of their ability to significantly increase engine operating temperatures with improved efficiency, reduce engine weight and cooling requirements. The development of prime-reliant environmental barrier coatings is essential to the viability and reliability of the envisioned CMC engine component applications, ensuring integrated EBC-CMC system durability and designs are achievable for successful applications of the game-changing component technologies and lifing methodologies.  This paper will emphasize recent NASA environmental barrier coating developments for SiC/SiC turbine airfoil components, utilizing advanced coating compositions, state-of-the-art processing methods, and combined mechanical and environment testing and durability evaluations. The coating-CMC degradations in the engine fatigue-creep and operating environments are particularly complex; one of the important coating development aspects is to better understand engine environmental interactions and coating life debits, and we have particularly addressed the effect of Calcium-Magnesium-Alumino-Silicate (CMAS) from road sand or volcano-ash deposits on the durability of the environmental barrier coating systems, and how the temperature capability, stability and cyclic life of the candidate rare earth oxide and silicate coating systems will be impacted in the presence of the CMAS at high temperatures and under simulated heat flux conditions. Advanced environmental barrier coating systems, including HfO2-Si with rare earth dopant based bond coat systems, will be discussed for the performance improvements to achieve better temperature capability and CMAS resistance for future engine operating conditions.  Keywords: Environmental barrier coatings; Ceramic Matrix Composites (CMCs); Calcium-Magnesium-Alumino-Silicate (CMAS)    

NASA’s advanced environmental barrier coatings development for SiC/SiC Ceramic matrix composites: Understanding CMAS degradations and resistance

https://dc.engconfintl.org/cgi/viewcontent.cgi?article=1041&amp;context=thermal_barrier_iv

NASA’s advanced environmental barrier coatings development for SiC/SiC Ceramic matrix composites: Understanding CMAS degradations and resistance

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